1 files changed, 14 insertions, 0 deletions
diff --git a/awklib/eg/prog/histsort.awk b/awklib/eg/prog/histsort.awk
new file mode 100644
index 00000000..c2c9d1a7
--- /dev/null
+++ b/awklib/eg/prog/histsort.awk
@@ -0,0 +1,14 @@
+# histsort.awk --- compact a shell history file
+# Arnold Robbins, arnold@gnu.ai.mit.edu, Public Domain
+# May 1993
+
+# Thanks to Byron Rakitzis for the general idea
+{
+    if (data[$0]++ == 0)
+        lines[++count] = $0
+}
+
+END {
+    for (i = 1; i <= count; i++)
+        print lines[i]
+}